CPU Communication Error

What does E22. mean?

This fault indicates a malfunction or error occurring in the inverter's built-in CPU during communications. This can be caused by significant electrical noise interference or an internal defect within the CPU or its communication hardware. It prevents the inverter from reliably communicating, potentially leading to erratic behavior or complete loss of control.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   Verify proper grounding of the inverter and control system to minimize noise susceptibility.

2. 4

   Check communication wiring for damage or interference.